Vanus valve, trans or electonics? help
My wife's 01 740il, 135K, has for the last 6 months been developing a (what I incorrectly called a surge) that was barely noticeable at light throttle, highway speeds. As I have watched, the tach when it drops engine speed to engage overdrive, the engine makes a growling or "snoring" sound and pops out of overdrive. Took it to a local bimmer shop (not dealer). Said the Vanus valve was bad from sludge (Thanks BMW service plan from original owner). Caused the control module mounted in conjunction with themostat housing to go bad because the vanus could not move properly confusing the module and burned it out. (not sure I buy it) Anyways, this growling, gear hunting, transmision chattering occurance happens ONLY after the car has achieved operating temp. I have taken the throttle body apart, no wear detectable. Have replaced the spark plugs and boots. HAve spent 1600 dollars on shop to replace vanus valve, control module, etc, Now problem is worse. And the check engine light does not come on (bulb burned out now) It should come on, I unplugged the RH cam timing sensor to check the functional change in the shifting. None. Please, any help would be appreciated. Don't have money for shop again and Wife won't drive it.
Last edited by DACollins; 12-15-2008 at 06:43 PM.